From: Richard Mortimer <richm@oldelvet.org.uk>
To: Andrew Morton <akpm@osdl.org>
Cc: richm@oldelvet.org.uk, Anton Blanchard <anton@samba.org>,
arnd@arndb.de, tytso@mit.edu, linux-arch@vger.kernel.org
Subject: Re: Using get_cycles for add_timer_randomness
Date: Mon, 16 Aug 2004 00:46:50 +0100 [thread overview]
Message-ID: <1092613609.4169.22.camel@duncow> (raw)
In-Reply-To: <20040815154821.2d6edb03.akpm@osdl.org>
On Sun, 2004-08-15 at 23:48, Andrew Morton wrote:
> Things have changed a bit - sparc now has special-case code in there too.
> Hopefully we can remove that now.
That came from Dave M & me before Anton remembered Arnd's patch. It can
be removed with the new patch applied.
> Is everyone OK with this?
I certainly am. I have tried the patch on sparc64 (albeit on 2.4.26) and
get similar results to Anton.
Richard
>
> From: Anton Blanchard <anton@samba.org>
>
> I tested how long it took to do a dd from /dev/random on ppc64 before and
> after this patch, while doing a ping flood from another machine.
>
> before:
> # /usr/bin/time dd if=/dev/random of=/dev/zero count=1k
> 0+51 records in
> Command terminated by signal 2
> 0.00user 0.00system 19:18.46elapsed 0%CPU (0avgtext+0avgdata 0maxresident)k
>
> I gave up after 19 minutes.
>
> after:
> # /usr/bin/time dd if=/dev/random of=/dev/zero count=1k
> 0+1024 records in
> 0.00user 0.00system 0:33.38elapsed 0%CPU (0avgtext+0avgdata 0maxresident)k
>
> Just over 33 seconds. Better.
> _
--
richm@oldelvet.org.uk
next prev parent reply other threads:[~2004-08-15 23:47 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-16 1:03 Using get_cycles for add_timer_randomness Arnd Bergmann
2004-08-10 16:24 ` Anton Blanchard
2004-08-14 18:36 ` Anton Blanchard
2004-08-15 22:48 ` Andrew Morton
2004-08-15 23:46 ` Richard Mortimer [this message]
2004-08-15 23:59 ` David S. Miller
2004-08-16 16:17 ` Theodore Ts'o
2004-08-16 16:22 ` William Lee Irwin III
2004-08-16 16:44 ` Ralf Baechle
2004-08-16 16:49 ` William Lee Irwin III
2004-08-19 18:26 ` Ralf Baechle
-- strict thread matches above, loose matches on Subject: below --
2004-08-16 18:53 Luck, Tony
2004-08-16 21:29 Luck, Tony
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1092613609.4169.22.camel@duncow \
--to=richm@oldelvet.org.uk \
--cc=akpm@osdl.org \
--cc=anton@samba.org \
--cc=arnd@arndb.de \
--cc=linux-arch@vger.kernel.org \
--cc=tytso@mit.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.